Select the correct answer.

Which relation is a function?

A.

x y

4 - 2

5 - 3

6 - 2

7 - 3

B.

x y

3 10

2 20

3 30

4 40

C.

x y

-5 2

-5 3

-10 4

-10 5

D.

x y

10 15

20 25

8 30

20 35

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Introduction to Functions: Mastery Test

The correct choice is A.

Step-by-step explanation:

The relation which is a function is the one in which none of the first coordinates repeated.

A.

x y

4 - 2

5 - 3

6 - 2

7 - 3

We can see that none of the first coordinates repeated in this relation.

Its graph will pass the vertical line test.

It is a function.